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Programming Enigma Puzzles
From New Scientist #2031, 25th May 1996 [link]
We spent our holiday on the oddly-shaped island of Hexonia. One day, we drove around the coast road which was in the form of a hexagon with each angle 120°. I remember noticing that each straight was a different perfect square whole number of kilometres and that the complete circuit was less than 500 kilometres.
How far did we drive?